When a PUCCH is affected, a shortened format may be used. Thus, the PUCCH may be transmitted in the same subframe as the SRS using a shortened PUCCH format. The SRS may be transmitted in the last symbol of the subframe, as illustrated in FIGS. 8A and 8B. The shortened format of PUCCH may occupy fewer than all fourteen symbols in a subframe. When configured not to interfere with SRS transmissions, the shortened form PUCCH may be transmitted in the same subframe as the SRS transmission. For example, a shortened format may be used for a first slot of the PUCCH. In another example, PUCCH may use only 1 slot for transmission.
FIGS. 8A and 8B illustrate examples of a PUSCH being punctured with an SRS transmission. In FIG. 8A, a PUSCH is punctured at symbol 12 to allow for switching, or retuning, to CC2 for transmission of the SRS. Another PUSCH is punctured at symbol 0 in order to facilitate switching, or retuning, from CC2 back to CC1 for the PUSCH. FIG. 8A also shows that a PUCCH may be adjusted to use a shortened format in the first slot in order to allow for retuning from CC2 for the SRS transmission. In FIG. 8A, the retuning time is 1 symbol. FIG. 8B illustrates an example with a retuning time of less than 1 symbol. For example, the retuning time may be around 20 μs. In FIG. 8B, the SRS transmission at CC2 may start transmitting after the 20 μs, so that a portion of the symbol is not transmitted by the UE.
